10:15am - 10:30amMO1-3: 1
Sources and fate of Icelandic dust reaching Svalbard
Beatrice Moroni1, Federica Bruschi1, Marco Massetti1, Carlos Pertusa2, Pavla Dagsson Waldhauserova3, Stefano Crocchianti1, Chiara Petroselli1, David Cappelletti1,4
1University of Perugia, Italy; 2University of Alicante, Spain; 3Agricultural University of Iceland, Iceland; 4Institute of Polar Science ISP-CNR, Italy
The present project aims to provide a contribution to the characterization of the dust component from Iceland capable of being transported over great distances towards Svalbard. A sampling campaign of sediments, resuspended dust and aerosols was carried out in Icelandic dust hot spots. The sediment samples underwent resuspension tests in a dust resuspension/sampling chamber designed for the purpose. All the samples were analysed by ICP-MS and SEM-EDS methods in order to compare soil, dust and aerosol samples, and finally compared with aerosol samples from Ny-Ålesund and Hornsund Arctic stations. The results of the geochemical investigation are reported and discussed.
10:30am - 10:45amMO1-3: 2
Characteristics and sources of particulate matter from an open pit mine and hydrometallurgical plant within the Congolese Copperbelt
John Kasongo1,2, Laurent Alleman1, Bruno Malet1, Jean Marie Kanda2, Arthur Kaniki2, Véronique Riffault1
1IMT NORD EUROPE, France; 2UNILU FACULTE DE POLYTECHNIQUE, RD Congo
The metal-bearing airborne particles pose obvious risks to human health.This study aimed to characterize and identify the sources of atmospheric dust collected around an open pit mine and hydrometallurgical plant on the Congolese Copperbelt. PM was collected using a Dekati 3-stage cascade impactor at eight sampling points around the mining site. Results indicated that PM2.5 concentrations ranged from 146 to 380 μg m-3. Silicon and related detrital elements: Al, K, etc. were abundant in all size fractions and showed a decreasing trend with PM size. Dust from dry mine dumps, rock blasting, and terrigenous sources were the main sources identified.
10:45am - 11:00amMO1-3: 3
Evolution characteristics of crop residue fires during STUB-BURN campaign in N-W India: Emission factors and aging indicators
Anjanay Pandey1, Vikram Singh1,6, Umer Ali1, Mohd Faisal1,5, Ajit Kumar2, Vikas Goel2, Sombir Pannu1, Yufang Hao5, Suman Mor3, Khaiwal Ravindra4, K.R. Daellenbach5, A.S.H. Prevot5, Mayank Kumar2
1Department of Chemical Engineering, Indian Institute of Technology Delhi, New Delhi, India; 2Department of Mechanical Engineering, Indian Institute of Technology Delhi, New Delhi, India; 3Department of Environment Studies, Panjab University, Chandigarh, 160014, India; 4Department of Community Medicine and School of Public Health, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, 160012, India; 5Laboratory of Atmospheric Chemistry, Paul Scherrer Institute, Villigen, Aargau, 5232, Switzerland; 6Centre of Excellence for Research in Climate Change and Air Pollution, Indian Institute of Technology Delhi, New Delhi,110016, India
Stubble burning (SB) in North-Western India significantly impacts air quality, particularly post-monsoon. To study fresh SB aerosols, we conducted the STUB-BURN campaign at a rural site in Punjab using CARLab, a mobile research platform with real-time PM₂.₅ and gas analyzers. Sampling period was from Oct 27–Nov 18, 2023 and we identified ten plume events based on CO and BB% enhancements. Emission factors (EFs) were estimated for key species. These first-of-their-kind regional EFs will aid emission inventory refinement and chemical transport modeling, providing crucial insights into agricultural residue burning emissions and aerosol evolution in N-W India.
11:00am - 11:15amMO1-3: 4
Dynamic Aging Effects and Mixing State of Hydrophilic Organics and Polyaromatic Hydrocarbons in Wildfire Smoke
Johannes Passig1, Ellen Iva Rosewig1, Mika Ihalainen2, Kerneels Jaars3, Kajar Köster4, Stefan Siebert5, Anni Hartikainen2, Olli Sippula2, Markus Somero2, Pasi Yli-Pirilä2, Pieter Van Zyl3, Saara Peltokorpi6, Angela Buchholz6, Hao Liqing6, Annele Virtanen6, Ville Vakkari7, Ralf Zimmermann1,8
1University of Rostock, Germany; 2Department of Environmental and Biological Sciences, University of Eastern Finland, Kuopio, Finland; 3Atmospheric Chemistry Research Group, Chemical Resource Beneficiation, North-West University, Potchefstroom, South Africa; 4Department of Environmental and Biological Sciences, University of Eastern Finland, Joensuu, Finland; 5Unit of Environmental Sciences and Management, North-West University, Potchefstroom, South Africa; 6Department of Technical Physics, University of Eastern Finland, Kuopio, Finland; 7Finnish Meteorological Institute, Helsinki, Finland; 8Photonion GmbH, Schwerin, Germany
Radiative properties and cloud condensation from wildfire aerosols depend on organic coatings and on the distribution of optically and nucleation-active substances across the particle ensemble. We show the distribution of hydrophilic molecules and hydrophobic polyaromatic hydrocarbons in a boreal forest smoke experiment. For the water-soluble phase, glyoxal and methylglyoxal are emitted directly from the combustion and oxalate is rapidly formed upon ageing. The co-existence of hydropobic, optical absorbing PAHs and hydrophilic oxalate on the same particles indicates that the resulting lensing and droplet activation are highly prevalent in wildfire smoke and need to be considered in models.
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